A bandeau bikini top suits a fuller bust about as well as a scarf suits a coat hook, so if you're a D cup or over, think twice before you commit. If you're smaller up top, or you've got a longer torso that needs the eye drawn, this is a lovely top, and I'd never tell you otherwise.
What you need to check before you buy, every single time, is the elastic and the fastening. A lot of these are sold as one piece with no ties at all, just a strip of elastic round the ribcage, and on paper that sounds fine until you're wading out past your waist and the whole thing starts its slow march south. Look for one with a tie at the back, or better still a halter strap you can add or take off depending on what you're doing that day. Check the cup lining too, some of them have none at all, which is grand for sunbathing and less grand for anything that involves movement. And look at where the top sits on the body in the photos, not just the model's shape but the proportion, because a bandeau that sits high and tight on one body will sit loose and gaping on another with a different ribcage.
What it clashes with is anything that already asks a lot of your shoulders and chest. Pair it with a high waisted bottom and it tends to work, because the eye has somewhere else to land, but pair it with something skimpy on both halves and you lose the shape of the thing entirely, it just reads as fabric. I'd also leave the heavy gold jewellery at home with this one, a chunky necklace sitting right across the top of a bandeau just competes with it, and competing with your own bikini is never a good look. A cover up with a big collar does the same thing, it crowds the neckline when the whole point of a bandeau is a clean, open line across the collarbone.
Where it's the wrong choice is anywhere with real water pressure, waves, a pool with a current, children who want to be thrown about. It wasn't built for that and no amount of double knotting changes it.
Get the fit right though, with proper ties and a lining that holds its shape, and there's nothing nicer for lying flat on a lounger with no strap marks to show for it afterwards.